Electric heating device



' T. C. RUSSELL ELECTRIC HEATING DEVTCE Filed April '7, 1922 f Puma! a. 21,'1924,

- UNITED vSri-"rasv PATENT OFFICE.

THOMAS C. BUSSELL, OF CHICAGO,

-`Theheating Application filed April 7, 1922. Serial No. 550,885.

Toallwhomitmay cnoem: w

Be it known that I, THOMAS C. Rnssnnn, a citizen of the United States, and a resident. of Chicago, in the county of Cook and State of Illinoisyhave invented certain new and useful Improvements in Electric Heating Devices, of which the following is a speclfication. i

My invention' relatesxto electric' heating ;devices and oovers improved arrangement and Securing of the resistance or heating wires. The object of the inve-ntion is to build up a compact, simple and eflicient heating unit which can be applied intimately to the surface of devices to be heated as for example flat irons; Waflle irons, cookin utensils, etc.

accordance with m "invention the resistance member in the orm of a fine Wire is preferably bent' in zigzag fashion and then laidV flat and arranged on a sup member such as a Sheet of mica. the resistance member in ment on the Sheet and so t its adjacent Sections or loops do not touch, I use fasten- 'ing devices in the form of st'aples which can' be readily applied to the sheet at desired points toreceive her and hold it flat and in place. w

'nie above and other features ofmy inlg. 2' is an enlarged sectional view onfl plme 2 2Fig. 1,

Fig. 3 is an enlarged sectional view on plaiel-FiLand 111x is a ta view uatratmg' the plication o the unit to adevioetobeheated. 1

element shown in Fig. 1 is nseinaflatiron. AsheetIO ,suitable material is cut for of mica or other .to the desired shape and the resistance orheating member 11 is a thereon. The hosting mbaristhen tE'Loper arrange-z the resistance meinlels the sides of' the Sheet. To securethe heating member in place alid to cause it to lie flatlyv against the Sheet I preferably utilize fastening members 14 in the. form of staplesf These staples can be readily ap` plied by means of a suitable machine at desired points to brid'e over the Wire and hold it against the plate. The staples may be applied across the loops 13 of 'the resistance member as shown; The staple members which' are originall of inverted' U Shape are applied throug the supporting Sheet with their vokes bridging the Wire, the legs of the Staples being then clinched or turned over against the bottom of the Sheet as clearly shown in Fig. 2.

Terminalsv 15 and 16 are provided for the heating element and are connected with 'zor more of the Wire Sections 12' at the end of the heating element. After insertion of 'the Wine Sections the terminal Sections 18 are subjected to pressure 'to securely clamp the Wire Sections and to make good electrical contact'therewith. To secure the 'terminale to the she'et 10 staples 14' are applied to the ends of the Wire Sections 12' which extend through the terminala.

In Fig. 4 I have shown a heating unit applied to' heat a member 19 which may be the base of a flat iron. On the base is first placed a layer or Sheet 20 of mica or otherv suitable insulat' material, On this is laid the inverted is' then applied a layer or blanket 21 of mica, asbestos or other eledz'ioal insulat' and heat resistin material. On 'top of the la er 21 is app ed the pmure plate322 W ich by means 'of screws 23 is drawn toward the base 19to securely clamp the heating unit and eatmg unit over which `i layers together.

and to bring the hosting elanont 'as close 'aspossible'w'thebasasothatth'o ented heat is efliciently utilind to heat e plate, theheatinlelmmnt W from,

thebaseo yhythethin yu'm.`

'Iheheatingmembermay'be n' ranged in circular, rectangular, spiral or other figures depending upon the shape and nature of the device to be heated. Several heating'units could also be arnanged one on top of the other With insulatingiplates between and the several heating e ements 'electricallj7 connected together. A heating structure of the desired capaci'ty can thus be readily built up.

I thus produce -a very simple and eflicient heating unit, 'and simple, leflicient and in-.

expensive means for securing the heating element on itsupper plate so that the unit can then be readily handled and assembled without danger of contact and short circuitng of adjacent sections of the folded Wire.

described'my invention, I claim theends of. said terminal being slitted and the ends of .said resistance member' being inserted through said slits to be electrically connected with said terminala' 2. In a heat-ing unit of the class described, 'the combination of an insulating sup orting sheet, a resistance element suppo on, terminals for said element, said terminals being lslitted and the heating element ends being inserted through the slits to be'l electrically connected With .the tenninals, and securing means engaging the heating element ends adjacent said terminale fon securing said terminals to 'the Sheet.

3. In a-heating unit,`the combination of a supporting Sheet, a heating Wire secured on said sheet, terminals for said wire, said4 terminals'being of sheet metal and slitted and alternate Sections'v formed by said slits being defleeted in o1`)po|si'tev directions to form a passageway, the ends of said Wire being inserted in vsaid passageways to be electrically connected with said terminale, and

means securing said terminale to said Sheet...

In' witness whereof, I hereunto. Subscribe vmy name this thday of April A. D., 1922.

THOMAS o. RUssELL.

there- 

